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Drills
(Forstner Bits)
Meterial:High CarbinSteel


Metric Systemmm
Flute Dia
d
Middle Shank
Dia.d
Small Shank
Dia d1
Overall Length
L
8 8 8 90
10
12
14 10
15
16
18
20
22
23
24
25 12
26
28
30
32 10
34
35
36
38 15
40
45
50
53
55 12.5
57 15.9
60
63 17.5
67
70
73 19
76
80
83
86
90


SETS (WOOD BOX)
Pcs.per set Specification
5 15 20 25 30 35
5 22 23 28(28.5) 35 53
15 10 12 15 16 18 20 22 25
26 28 30 35 40 45 50


British System:mm
Flute Dia
d
Middle Shank
Dia.d
Small Shank
Dia d1
Overall Length
L
1/4 7.5 9.5 90
3/8
1/2 8
5/8 10
3/4
7/8
1" 12
1-1/8
1-1/4
1-3/8
1-1/2 15
1-5/8
1-3/4
1-7/8
2"
2-1/8
2-1/4 12.7 159
2-3/8
2-1/2 17.5
2-5/8
2-3/4
2-7/8 19
3"
3-1/8
3-1/4
3-3/8
3-1/2
3-5/8
3-3/4
3-7/8
4"


SETS(WOOD BOX)
Pcs.per set Specification
7 1/4 3/8 1/2 5/8 3/4 7/8 1"
16
1-1/2 1-5/6 1-3/4 1-7/8 2" 2-1/8
8 2-1/4 2-3/8 2-1/2 2-5/8 2-3/4 2-7/8 3" 3-1/8
24 1/4 3/8 1/2 5/8 3/4 7/8 1" 1-1/8 1-1/4 1-3/8
1-1/2 1-5/8 1-3/4 1-7/8 2" 2-1/8 2-1/4
2-3/8 2-1/2 2-5/8 2-3/4 2-7/8 3" 3-1/8





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